番石榴ImmutableList靜態函數checkNotNull沒有找到

Question

我很新的Java和Android Studio，因爲我主要工作在Xamarin下。
我正在實施一個語音識別項目（最初由Xamarin開發，但現在無法使用，導致Google在某處推出了很大的延遲），試圖使用新的（仍是測試版）雲語音識別。 我已經從here下載了一個示例，並試圖使用它，但我面臨一個奇怪的（對我來說）問題。 SpeechSettings對象使用ImmutableList來保存del默認的API範圍，但是當ImmutableList add("something").build()嘗試調用checkNotNull函數時，我遇到了很多錯誤。我已經從SpeechSettings對象創建中提取了列表的創建，並且爲簡單起見，我已將它放在Button的單擊事件中。創建（或更好地插入一個String元素）會導致相同的錯誤列表。 這是點擊監聽器的代碼：

bRecon.setOnClickListener(new View.OnClickListener() 
{ 
    @Override 
    public void onClick(View v) 
    { 
     try 
     { 
      ImmutableList<String> lTest = ImmutableList.String>builder().add("132").build(); 
     } 
     catch (Exception ilEx) 
     { 
     } 

     SpeechRecon sr = new SpeechRecon(); 
    }); 
} 

，這是當ImmutableList創建相對logcat的輸出：

11-24 13:26:03.007 31057-31057/it.sia.cloudspeechrpcjava I/dalvikvm: Could not find method com.google.common.base.Preconditions.checkNotNull, referenced from method com.google.common.collect.ImmutableList.copyOf 
11-24 13:26:03.007 31057-31057/it.sia.cloudspeechrpcjava W/dalvikvm: VFY: unable to resolve static method 26168: Lcom/google/common/base/Preconditions;.checkNotNull (Ljava/lang/Object;)Ljava/lang/Object; 
11-24 13:26:03.007 31057-31057/it.sia.cloudspeechrpcjava D/dalvikvm: VFY: replacing opcode 0x71 at 0x0000 
11-24 13:26:03.017 31057-31057/it.sia.cloudspeechrpcjava I/dalvikvm: Could not find method com.google.common.base.Joiner.appendTo, referenced from method com.google.common.collect.ImmutableCollection.toString 
11-24 13:26:03.017 31057-31057/it.sia.cloudspeechrpcjava W/dalvikvm: VFY: unable to resolve virtual method 26143: Lcom/google/common/base/Joiner;.appendTo (Ljava/lang/StringBuilder;Ljava/lang/Iterable;)Ljava/lang/StringBuilder; 
11-24 13:26:03.017 31057-31057/it.sia.cloudspeechrpcjava D/dalvikvm: VFY: replacing opcode 0x6e at 0x0013 
11-24 13:26:03.022 31057-31057/it.sia.cloudspeechrpcjava I/dalvikvm: Could not find method com.google.common.base.Preconditions.checkNotNull, referenced from method com.google.common.collect.ImmutableList$Builder.add 
11-24 13:26:03.022 31057-31057/it.sia.cloudspeechrpcjava W/dalvikvm: VFY: unable to resolve static method 26168: Lcom/google/common/base/Preconditions;.checkNotNull (Ljava/lang/Object;)Ljava/lang/Object; 
11-24 13:26:03.022 31057-31057/it.sia.cloudspeechrpcjava D/dalvikvm: VFY: replacing opcode 0x71 at 0x0002 
11-24 13:26:03.027 31057-31057/it.sia.cloudspeechrpcjava I/dalvikvm: Could not find method com.google.common.base.Preconditions.checkArgument, referenced from method com.google.common.collect.Lists.computeArrayListCapacity 
11-24 13:26:03.027 31057-31057/it.sia.cloudspeechrpcjava W/dalvikvm: VFY: unable to resolve static method 26164: Lcom/google/common/base/Preconditions;.checkArgument (Z)V 
11-24 13:26:03.027 31057-31057/it.sia.cloudspeechrpcjava D/dalvikvm: VFY: replacing opcode 0x71 at 0x0003 
11-24 13:26:03.027 31057-31057/it.sia.cloudspeechrpcjava I/dalvikvm: Could not find method com.google.common.base.Preconditions.checkNotNull, referenced from method com.google.common.collect.Lists.newArrayList 
11-24 13:26:03.027 31057-31057/it.sia.cloudspeechrpcjava W/dalvikvm: VFY: unable to resolve static method 26168: Lcom/google/common/base/Preconditions;.checkNotNull (Ljava/lang/Object;)Ljava/lang/Object; 
11-24 13:26:03.027 31057-31057/it.sia.cloudspeechrpcjava D/dalvikvm: VFY: replacing opcode 0x71 at 0x0000 
11-24 13:26:03.027 31057-31057/it.sia.cloudspeechrpcjava I/dalvikvm: Could not find method com.google.common.base.Preconditions.checkNotNull, referenced from method com.google.common.collect.Lists.newArrayList 
11-24 13:26:03.027 31057-31057/it.sia.cloudspeechrpcjava W/dalvikvm: VFY: unable to resolve static method 26168: Lcom/google/common/base/Preconditions;.checkNotNull (Ljava/lang/Object;)Ljava/lang/Object; 
11-24 13:26:03.027 31057-31057/it.sia.cloudspeechrpcjava D/dalvikvm: VFY: replacing opcode 0x71 at 0x0000 
11-24 13:26:03.032 31057-31057/it.sia.cloudspeechrpcjava I/dalvikvm: Could not find method com.google.common.base.Preconditions.checkNotNull, referenced from method com.google.common.collect.Lists.newArrayList 
11-24 13:26:03.032 31057-31057/it.sia.cloudspeechrpcjava W/dalvikvm: VFY: unable to resolve static method 26168: Lcom/google/common/base/Preconditions;.checkNotNull (Ljava/lang/Object;)Ljava/lang/Object; 
11-24 13:26:03.032 31057-31057/it.sia.cloudspeechrpcjava D/dalvikvm: VFY: replacing opcode 0x71 at 0x0000 
11-24 13:26:03.032 31057-31057/it.sia.cloudspeechrpcjava I/dalvikvm: Could not find method com.google.common.base.Preconditions.checkNotNull, referenced from method com.google.common.collect.Lists.partition 
11-24 13:26:03.032 31057-31057/it.sia.cloudspeechrpcjava W/dalvikvm: VFY: unable to resolve static method 26168: Lcom/google/common/base/Preconditions;.checkNotNull (Ljava/lang/Object;)Ljava/lang/Object; 
11-24 13:26:03.032 31057-31057/it.sia.cloudspeechrpcjava D/dalvikvm: VFY: replacing opcode 0x71 at 0x0000 
11-24 13:26:03.037 31057-31057/it.sia.cloudspeechrpcjava W/dalvikvm: VFY: unable to find class referenced in signature (Lcom/google/common/base/Function;) 
11-24 13:26:03.037 31057-31057/it.sia.cloudspeechrpcjava W/dalvikvm: VFY: unable to find class referenced in signature (Lcom/google/common/base/Function;) 
11-24 13:26:03.042 31057-31057/it.sia.cloudspeechrpcjava W/dalvikvm: VFY: unable to find class referenced in signature (Lcom/google/common/base/Function;) 

，這裏是我的gradle.build文件：

apply plugin: 'com.android.application' 

android { 
    compileSdkVersion 25 
    buildToolsVersion "25.0.0" 
    defaultConfig { 
     applicationId "it.sia.cloudspeechrpcjava" 
     minSdkVersion 19 
     targetSdkVersion 19 
     versionCode 1 
     versionName "1.0" 
     testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner" 
    } 
    buildTypes { 
     release { 
      minifyEnabled false 
      proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro' 
     } 
    } 
    packagingOptions { 
     pickFirst 'META-INF/io.netty.versions.properties' 
     exclude 'META-INF/INDEX.LIST' 
    } 
} 

dependencies { 
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', 
      { 
       exclude group: 'com.android.support', module: 'support-annotations' 
      }) 
    androidTestCompile 'com.google.code.findbugs:jsr305:3.0.0' 
    testCompile 'junit:junit:4.12' 
    compile 'com.android.support:appcompat-v7:25.0.1' 

    compile files('libs/guava-gwt-20.0.jar') 
    compile files('libs/guava-collections-r03.jar') 
    compile files('libs/gax-0.0.25.jar') 
    compile files('libs/grpc-all-1.0.1.jar') 
    compile files('libs/grpc-core-1.0.1.jar') 
    compile files('libs/grpc-core-proto-0.0.6.jar') 
    compile files('libs/grpc-google-cloud-speech-v1beta1-0.1.3.jar') 
    compile files('libs/joda-time-2.9.6.jar') 
    compile files('libs/protobuf-java-3.1.0.jar') 
} 

如果你們中的任何一個人都能指點我一個可能的解決方案，那就太好了。 謝謝。 Rodolfo， 。

Answer 1

compile files('libs/guava-collections-r03.jar')「Guava-Collections」未更新6年，取決於您未下載幷包含的其他一些圖書館。

guava-primitives被描述爲「包含實用程序類的庫」，因此它可能包含丟失的Preconditions類。

將guava-collections替換爲guava（20.0）的最新版本，它可能會工作。 我也推薦學習有關自動依賴管理的知識，因爲手動下載庫並確保這些庫的依賴關係很快就會變得非常混亂。